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SUMMARY:6-Benzylaminopurine modulates photosynthetic performance and cytok
 inin homeostasis in Lemna minor under salt stress
DTSTART;VALUE=DATE-TIME:20260929T081500Z
DTEND;VALUE=DATE-TIME:20260929T083000Z
DTSTAMP;VALUE=DATE-TIME:20260916T130421Z
UID:indico-contribution-2896@cern.ch
DESCRIPTION:Speakers: Vesna Peršić (Department of Biology\, Josip Juraj 
 Strossmayer University of Osijek)\nSalinity primarily reduces plant produc
 tivity by disrupting the photosynthetic apparatus\, and cytokinins are con
 sidered to be context-dependent regulators of its tolerance (1-3). This st
 udy aimed to determine if and how 6-benzylaminopurine (1 μM 6-BA) protect
 s the photosynthetic apparatus of *Lemna minor* under salt stress (50\, 10
 0\, 150 mM NaCl) and to analyze how it modulates accompanying metabolic re
 sponses. Chlorophyll *a* fluorescence and oxygen exchange were measured to
  assess plant responses. Simultaneously\, we profiled hormone and cytokini
 n levels and quantified phenolics\, antioxidant capacity\, pigments\, prol
 ine\, malondialdehyde (MDA)\, starch\, and antioxidant enzymes. The intera
 ction between 6-BA and NaCl was the most significant source of variation i
 n the fluorescence response (PERMANOVA R² = 16.5%\, p < 0.001). 6-BA had 
 a modest cost at low salinity\, but it stabilized PSII at high salinity (r
 eversing between 100 and 150 mM)\, while the PSI acceptor side declined re
 gardless. A similar pattern was observed in cytokinin homeostasis\, where 
 6-BA decreased the endogenous cytokinin pool by half (0.52-fold) and incre
 ased it by more than twofold at 150 mM (2.24-fold)\, with a reversal occur
 ring between 50 and 100 mM. Salinity decreased levels of jasmonates\, auxi
 n\, phenolics\, antioxidant capacity\, and pigments but increased levels o
 f ABA\, proline\, MDA\, and starch as expected. 6-BA decreased ABA and MDA
  at all salinity levels and induced a maximal antioxidant response at 100 
 mM that was lost at 150 mM NaCl. The results suggest that 6-BA improves sa
 lt tolerance of *L. minor* by coordinating stress-level-dependent adjustme
 nts of photosynthesis\, respiration\, hormonal and antioxidant metabolism.
 \n\nhttps://indico.unina.it/event/117/contributions/2896/
LOCATION:Department of Agricultural Sciences of the University of Napoli F
 ederico II\, Portici\, Italy Sala Cinese
URL:https://indico.unina.it/event/117/contributions/2896/
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